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Whats the RON of LPG? 

 

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 Post subject: Whats the RON of LPG?
Posted: Sun Jun 11, 2006 11:12 pm 
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someone told me the RON of LPG is higher than PULP , r they full of sh*t ?

 

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Posted: Mon Jun 12, 2006 12:19 am 
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i think the RON of lpg is higher
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Posted: Mon Jun 12, 2006 12:38 am 
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nah its true the RON of lpg is approx 103 whereas PULP is 98RON

 

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Posted: Mon Jun 12, 2006 12:56 am 
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Yep lpg has a higher RON rating but also has a slower flame speed.

 

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Posted: Mon Jun 12, 2006 12:06 pm 
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yeah it has lees energy per litre, although it's ron is higher.
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Posted: Mon Jun 12, 2006 12:24 pm 
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Automotive LPG consists mainly of a mixture of propane and butane. At any one time the proportion of propane and butane in commercially available LPG can vary, but in Melbourne is typically around 60 percent (by volume) propane and 40 percent butane. This varying composition can marginally influence the exhaust emissions and fuel consumption of a particular vehicle.

The two major sources of LPG are from natural gas processing and petroleum refining. Although it has a higher octane rating than regular unleaded petrol (about 105 compared with 91?), it has a lower energy density, which results in a fuel consumption that is usually about 30 percent greater per kilometre. It is stored as a liquid under pressure, but at ambient pressure and temperatures becomes a gas.

 

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Posted: Mon Jun 12, 2006 2:13 pm 
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RON can vary anywhere between 80-110 depending on your gas setup and how hot it runs but @ the pump around 103-110.
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Posted: Mon Jun 12, 2006 3:57 pm 
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gryph wrote:
RON can vary anywhere between 80-110 depending on your gas setup and how hot it runs but @ the pump around 103-110.


How does the system effect the RON of the Fuel??

 

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Posted: Mon Jun 12, 2006 5:12 pm 
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Because gas is already a gas (?) you don't have to mix it in the manifold like petrol. With petrol, you have to covert it to a "gas" (tiny dropplets) in order for it to mix properly with the air. For this you need heat, and manifold "roughness".

For gas, because it is already a gas, you don't need the heat. In fact, if you run the engine as cold as possible, you actualy get more gas into the cylinder, as it is more dense. (There is a limit though)

Some gas systems run a simple coverter with a complex mixer (Gasresearch) or the opposite (Tickford Gas) It is the former which generaly gives you the best economy/power.
However, sequential injection is now available for most late model cars, so there is not too much of a loss of power, or economy.

The RON of the fuel is anybody guess, despite what the websites state. Treat it as standard unleaded, (91) and you really can't go wrong. It will cause pinging if too much compression is applied. Compression rates can be upped, but the next load of gas you get may not be the same as the last. The cheaper gases (Independant stations) can have a lot of rubbish mixed with it, which can cause converter blockages. This is not a reason to steer clear of Independant stations tho'.
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Posted: Mon Jun 12, 2006 7:48 pm 
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Hence the reason you need colder spark plugs with lpg...

http://www.garbee.net/~cabell/SparkPlugData.htm
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Posted: Mon Jun 12, 2006 8:15 pm 
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Not much to do with RON but i heard about a guy in Western Vic that flies hot air ballons, anyways he recently was up with some tourists and all was good until he changed gas bottles (LPG) the balloon started to drop as there wasnt enough heat from the new bottle of gas. In desperation he changed back to an older bottle that had enough to land safely. He notified CASA and had the gas tested which was bought from a service station (unknown) the results came back and the percentage was 40% propane 60% butane. So basically the price is going up and the quality is going down. Im not sure if there is a standard for LPG like petrol in Australia, if there isnt there should be.
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Posted: Mon Jun 12, 2006 9:21 pm 
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It was my understanding that the %butane had a direct effect on the RON. That it was the manufacturers method of reducing the octane to a level more suitable for auto use.
And you are right there should be an Australian Standard for this.

 

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Posted: Mon Jun 12, 2006 9:46 pm 
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Man, that is some info on spark plugs, ashman1985.

I think you are correct Madmax, as far as the % butane goes. I believe that when LPG first appeared, it had a much higher Butane ratio, and comp ratios could easily be increased. Since then, the fuel companies found that they could get more money by reducing the mix, hence the mix in todays gas. I say this, because I had a 351 C built to run on gas in 1987ish, and ran 302 heads and thus it had higher comp than "standard". However, after about 18 months, it started pinging on gas, and I had to have the combustion chambers machined to reduce the compression. after that, no probs.

No-one I know in the gas industry really has any idea of the RON of gas. And I talk to a lot of experienced people.
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Posted: Tue Jun 13, 2006 10:53 am 
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madmax wrote:
It was my understanding that the %butane had a direct effect on the RON. That it was the manufacturers method of reducing the octane to a level more suitable for auto use.
And you are right there should be an Australian Standard for this.


When talking gas its the Propane that gives it the RON but the Butane that gives it the energy rating. 100% propane (what they use in the US) has a RON of 115 or there abouts. the s**t we get here maxes our at 110 but is most commonly between the 100 and 105 mark.

And No Australia does not have a set standard to LPG guality. In actual fact the only fuel standards they have are that you must display on your pumps if your selling ethanol blended fuel. We have the worst quality fuel in the world. Even 3rd world countries have better go juice then we do.
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Posted: Tue Jun 13, 2006 11:40 am 
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xcabbi wrote:
madmax wrote:
It was my understanding that the %butane had a direct effect on the RON. That it was the manufacturers method of reducing the octane to a level more suitable for auto use.
And you are right there should be an Australian Standard for this.


When talking gas its the Propane that gives it the RON but the Butane that gives it the energy rating. 100% propane (what they use in the US) has a RON of 115 or there abouts. the s**t we get here maxes our at 110 but is most commonly between the 100 and 105 mark.

And No Australia does not have a set standard to LPG guality. In actual fact the only fuel standards they have are that you must display on your pumps if your selling ethanol blended fuel. We have the worst quality fuel in the world. Even 3rd world countries have better go juice then we do.


So does that mean adding more butane reduces the RON?

I use to run my BBQ on car gas, but it never worked as well as straight BBQ Propane. Far cheaper though :)

 

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